Insulating-joint



-w. H. LAU & P. A. BREDSVOLD.

INSULATING JOINT.

No. 593,381. Patented Nov. 9, 1897.

I W J UNITED STATES PATENT ()FFICE.

IVILLY H. LAU AND PAUL A. BREDSVOLD, OF CHICAGO, ILLINOIS.

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SPECIFICATION forming part of Letters Patent No. 593,381, dated November 9, 1897.

' Application filed February 12, 1897. Serial No. 623,107, (No model.)

To all whom it may concern:

Be it known that we, WILLY H. LAU and PAUL A. BREDSVOLD, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Insulating- Joints for Gas- Piping, of which the following, when taken in connection with the drawings accompanyin g and forming a part hereof, is a full and complete description sufficient to enable those skilled in the art to which it pertains to understand, make, and use the same.

The object of this invention is to obtain an insulating-joint for pipe-coupling which shall consist of but few pieces readily joined together without the use of cement in such manner as to be gas-tight and insulated, so that an electric current connected to the gas-pipe below the coupling will not be grounded.

A further object of the invention is to so join the several parts together that they will remain permanently insulated and gas-tight.

In the drawings referredto as forming a part of this specification, Figure 1 as an elevation of the insulating-joint for gas-piping embodying the invention; Fig. 2, a vertical sectional view of the outer piece of the insulatingjoint with the inner pieces thereof shown in elevation; Fig. 3, a horizontal crosssectional viewon line 3 3 of Fig. 2, and Fig. a a top plan view thereof.

A reference-letter used to designate a given part is employed to indicate such part throughout the several figures of the drawings wherever the same appears.

A is the outer shell of the insulating-joint embodying our invention, and B B are ribs forming corrugations. Ribs B B are used merely to enable a pipe-wrench to be firmly clasped on part A in assembling the several parts constituting the insulating-j oint.

C is the rim of shell or casing A, designed to be corrugated or stamped to fit closely to the periphery of part D of the insulating-joint when the several parts thereof are assembled and adjusted to prevent any change in the relative position of such parts by any use to which the joint may be put.

D is the part of the insulatingjoint designed to be secured by screwing to a gaspipe.

E is the part of the insulating-joint to which is designed to be secured a chandelier or the gas-pipe exposed to view in the ordinary piping of buildings.

F is a shoulder on the lower end of part E,

and G is a corresponding shoulder in shell A.

II are screw-threads on part D, and I I are corresponding internal screw-threads in. shell A.

J K are theendsof the parts D E, which come adjacent to each other when the several parts are assembled, and such ends have radial ribs or corrugations j j j 7.; 76 k, respectively fitting into each other and extending from the periphery to near the passage-way L, extending through such parts.

M is a layer of mica or other non-conducting material placed between parts D and E on the corrugated portion thereof, and N is a washer, of leather, rubber, or other non-conducting material adapted to make a gastight joint when the several parts constituting the insulating-joint embodying our invention are assembled, placed between such parts D E immediately surrounding the passageway L.

While the washer N may well be made of rubber or leather, other material, as rawhide, papier-mach, and the like electric nonconducting and elastic material,may be used. So we do not confine ourselves to the use of any particular material, it only being necessary that such Washer N is both gas-tight and nonconducting when the parts D E are pressed closely together.

M is a layer of mica or other non-conducting material placed between the parts A E on shoulders F G. p

d d are. peripheral ribs, lugs, or corrugations on part D.

To assemble the several parts forming the insulating-joint embodying this invention, the washer N and layer M of mica or other non-conducting material are placed between the parts D E and also between parts E and A, and the outer shell A placed over such 7 parts D E. The parts D E are then pressed closely together and held from turning, as by being placed in an ordinary vise, and the shell A turned-as, say, with a pipe-wrench to engage the screw-threads H I and so force the shoulder Gin part A to close contact with shoulder F on part E, or, rather,to force shoulder G into close contact with layer M of non-conducting material interposed between shoulders G and F. At the same time the end K of part E is forced into close contact with layer M of non-conducting material interposed between ends J K and washer N, also interposed between such ends, so rendering the passage-way L gas-tight. After shell Ahas been turned firmly into place the upper end 0 thereof is forced or pressed in between the ribs cl (Z on part D to fit closely thereto. The part 0 of shell A is in the last-described operation slightly ribbed or corrugated, as is well illustrated in Fig. 1. When so pressed, as last above described, against the part D, the shell A will be held rigidly in place with reference to parts D and E, so that the device can be screwed on and off of a gas-pipe and a gas-pipe can be screwed into and removed from the device without afiecting the relative position of parts D, E, and A.

Having thus described our invention, what we claim as new, and desire to secure by Letters Patent, ,is

In an insulating-joint for gas-piping, the

combination of an outer shell having internal screw-threads and an internal inwardly-flax ing shoulder, with parts fitting into the shell, one of such parts having an external screwth read fitting into the screw-threads on the shell and the other of such parts having a shoulder corresponding with the shoulder in the shelLboth of such parts having at adjacent ends radial grooves, a layer of nonconducting material interposed between the shoulder in the shell and the adjacent shoulder on one of the inner parts, a layer of nonconducting material interposed on the radial grooves between the ends of the inner parts, and a washer which is both gas-tight and nonconducting as described,when under pressure, interposed between the ends of the inner parts, peripheral ribs on the screw-threaded one of the inner parts, and the outer shell forced into the grooves formed by the peripheral ribs, substantially as described.

WILLY H. LAU. PAUL A. BREDSVOLD. In presence of- CHARLES TURNER BROWN, M. B. LAWRENCE. 

